Pre-Alg 3.1 Multiplying Integers & Decimals
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Transcript of Pre-Alg 3.1 Multiplying Integers & Decimals
Pre-Algebra
3.1 & 3.2
Multiplying Integers & Decimals
Part 1 & 2
Think-Pair-Share
+ + = +
- - = +
- + = -
+ - = -
Rules:
HChow did it come about that
9 + 9 + 99, 3 times
9 x 3
Ancient
Babylonians
~4000 yrs ago
Multiplication = repeated addition
What is 9, 3 times?9 x 3
Division = repeated subtraction
9 + 9 + 9
12 - 3 - 3 - 3 - 3
12 ÷ 3How many 3's are in 12?
+ + = +
- - = +
- + = -
+ - = -
Rules: - = opposite, + =
x
Face in the direction of the sign
+- Walk in the
direction of the sign
| | | | | | | | | | | 0 1 2 3 4 5-1-2-3-4-5
+- + -
+-
x
Face in the direction of the sign
+-
Walk in the direction of the sign
| | | | | | | | | | | 0 1 2 3 4 5-1-2-3-4-5
+- + -
+- 10 5
xFace in the
direction of the sign
+-
Walk in the direction of the sign
| | | | | | | | | | | 0 1 2 3 4 5-1-2-3-4-5
+- + -
+- 5.1 -7
xFace in the
direction of the sign
+-
Walk in the direction of the sign
| | | | | | | | | | | 0 1 2 3 4 5-1-2-3-4-5
+- + -
+- -2.7 -2.3
xFace in the
direction of the sign
+-
Walk in the direction of the sign
| | | | | | | | | | | 0 1 2 3 4 5-1-2-3-4-5
+- + -
+- -3.8 13
Determine the sign of the product. SMOTD
x x x
Rules: Positive product = mult. even amount of negatives
Negative product = mult. odd amount of negatives.
Order of Operations: SMOTD
How to drive a car.
Unlock the car.
Sit on the seat.
Enter key into ignition, turn.
Put on your seatbelt.
Press brake, shift to "drive."
Check mirrors.
P
E
MD
AS
Order of Operations:
PEMDAS
PEMDASPEDMASPEMDSAPEDMSA
HCP
E
MD
AS
P
E
MD
AS
P
E
MD
AS